Dashboard showing Acme Corp's security posture with 8 open findings and test activity timeline.
Automated hacker intuition
Rethink Application Security
Your team runs scanners, schedules pentests, and manages a bug bounty queue. None of it works the way an attacker would.
Sybil is the offensive security team you don't have: a system of AI agents that finds, exploits, and validates real vulnerabilities in your application, continuously. Run black-box, grey-box, or white-box- whichever fits your team. Your team ships fixes through the workflow you already use, and queries Sybil directly to see what was tested and what wasn't.
problem
Why security can't keep up
X-mark icon indicating a security gap
Developers ship code faster than security teams can review it.
X-mark icon indicating a security gap
Scanners flood teams with findings nobody has time to triage.
X-mark icon indicating a security gap
Manual pentests are a snapshot, stale before the report is even delivered.
X-mark icon indicating a security gap
Bug bounty programs trade one problem for another: unpredictable spend, no guaranteed coverage, a queue of unverified submissions.
Trusted by security-serious teams
Notion logoCursor logoThinking Machines logoturbopuffer logoBaseten logo
Testimonial

“Sybil has been great. Super helpful. Quick. Only positive things.”

Michael Truell
CEO, Cursor
Choose your testing approach
Black-box
No source required
No source code, no internal access required. Give Sybil a scope at the same level of detail you'd hand a third-party pentest firm. Sybil maps the application and starts testing the same day.
Grey-box
Share limited context: API docs, architecture diagrams, or a test account, without handing over source. Grey-box narrows Sybil's search space faster than black-box alone, surfaces logic and access-control flaws that need account context, and keeps testing scoped to what you're comfortable exposing.
White-box • Opt-in
Share source code for deeper context. White-box shortens time to first finding, lets Sybil trace root cause at the code level, and produces remediation precise enough for your engineers — or their AI coding assistants — to apply directly.
Point Sybil at a live URL and stand back
Sybil starts exploring and testing the application right away.
01
Authenticate
Hand Sybil credentials for full coverage, or run unauthenticated, no source code required either way.
Sybil sets up test accounts and handles auth automatically: username/password, TOTP, magic links, email OTP, Okta/SSO, even self-registration, re-authenticating on its own and remembering auth patterns for next time.
Screenshot showing a web server response with HTTP 200 OK status and related headers in a black interface.
/admin/polls/question/?q=zap
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Response
Request
Response headers
HTTP/1.1 200 OK Server: nginx/1.14.2 Date: Fri, 09 Oct 2020 21:43:04 GMT Content-Type: text/html; charset=utf-8 Content-Length: 5088 Connection: keep-alive Expires: Fri, 09 Oct 2020 21:43:04 GMT Cache-Control: max-age=0, no-cache, no-store, must-revalidate, private Vary: Cookie X-Frame-Options: DENY X-Content-Type-Options: nosniff Set-Cookie: csrftoken=K4tvsNT4IAs8recg8m1bLf

02

Map

Before testing starts, Sybil builds a model of your application: purpose, tech stack, and full attack surface, authenticated and unauthenticated. You can see this map yourself, so your team knows exactly what's exposed and what's been tested.

Q3 Security Assessment Test 1 plan showing setup steps and attack plan with status indicators on dark background.

/api/v2/sitemap?scope=full

Response

Request

Response headers

HTTP/1.1 200 OK Server: nginx/1.14.2 Date: Fri, 09 Oct 2020 21:44:10 GMT Content-Type: application/json Content-Length: 18244 Connection: keep-alive X-Endpoints-Discovered: 312 X-Roles-Mapped: 6 Cache-Control: no-store Vary: Cookie

03

Attack

A hierarchy of specialized agents tests hypotheses across your applications, each owning a domain like auth, business logic, or injection. The edge is chaining: combining findings into real exploit paths the way a human attacker would.

Dashboard showing testing status with 88 specialists assigned and coverage of 18 of 22 sub-areas across security fronts.

/checkout/cart/?id=1337' OR '1'='1

Response

Request

Response headers

HTTP/1.1 500 Internal Server Error Server: nginx/1.14.2 Date: Fri, 09 Oct 2020 21:46:52 GMT Content-Type: text/html; charset=utf-8 Content-Length: 2114 X-Powered-By: Express X-SQL-Error: near "OR": syntax error Connection: keep-alive

04

Validate

Every finding passes a multi-stage validation pipeline: deduplication, reproducibility, false-positive triage. Nothing surfaces until it's reproduced independently.

Security report showing SQL injection attack evidence on login endpoint with unusual database query patterns.

/api/v1/findings/4471/validate

Response

Request

Response headers

HTTP/1.1 200 OK Server: nginx/1.14.2 Date: Fri, 09 Oct 2020 21:52:03 GMT Content-Type: application/json Content-Length: 866 X-Finding-Status: confirmed X-False-Positive: false Cache-Control: no-store

05

Remediate

Each finding includes detailed AI-generated remediation recommendations, plus a "Fix with AI" flow that builds a ready-to-run prompt (or CLI command for Codex, Claude Code, or Cursor) pointing your coding assistant at the RunSybil MCP server to pull finding details and auto-remediate locally. Trigger a retest and an automated validator agent re-runs the original attack to confirm the vulnerability is actually fixed and not just returning a different error. Findings and reports track remediation status end-to-end, so you can see open vs. remediated issues across the full engagement.

Timeline showing three completed steps: Discovered, Finding Reported on 8/5/2026, and Closed (Fixed).

/api/v1/findings/4471/remediate

Response

Request

Response headers

HTTP/1.1 200 OK Server: nginx/1.14.2 Date: Fri, 09 Oct 2020 22:03:41 GMT Content-Type: application/json Content-Length: 512 X-Remediation-Status: patched X-Retest-Result: pass Connection: keep-alive

06

Continuous

After the initial engagement, Sybil tests only what changed, triggered by a PR, a manual run, or a set cadence, informed by everything it already knows about your application. That's what makes ongoing coverage viable at scale, instead of a scanner re-running blindly on a timer.

Dashboard showing continuous testing status with completed tests and a test completed popup summary.
What Sybil finds
Beyond OWASP Top 10
Sybil finds bugs that aren't on any checklist yet, because Sybil reasons about your specific application instead of just testing for known signatures. Every finding ships with a CVSS 3.1 score and CWE ID.
Access control icon
Access control
IDOR, privilege escalation, multi-tenant isolation, RBAC bypass, ...
Server-side icon
Server-side
SSRF, cryptographic failures, OWASP Top 10, CWE/CVE mapping, ...
Logic icon
Logic
Business-logic flaws, multi-step attack chains, auth-flow abuse, race conditions, ...
Injection icon
Injection
SQL/NoSQL, OS/LDAP, deserialization, file upload and path traversal, ...
Novel vulnerabilities icon
Novel vulnerabilities
0 days that don't match a known signature.
Client-side icon
Client-side
XSS (reflected, stored, DOM), CSRF, clickjacking, open redirect, ...
What's in every finding
Dashboard showing GraphQL introspection bypass vulnerability with high severity, CVSS 7.1, and open status.
Checkmark icon
CWE ID and CVSS 3.1 severity
Checkmark icon
HTTP request/response pair and reproduction steps
Checkmark icon
Affected components
Checkmark icon
Remediation precise enough for an AI coding assistant
Checkmark icon
Full exploit chain
Checkmark icon
Step-by-step validation log
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Business impact, contextualized to your application
Checkmark icon
Export: PDF, CSV, JSON, REST API, MCP server, SOC 2 report
OWASP Top 10 list showing vulnerability and security counts for various risks, including Broken Access Control and Injection.
Every action Sybil takes is logged and visualized. Surface and coverage maps show what your application looks like from an attacker's perspective, and exactly which parts Sybil has tested, so your team can answer the two questions that matter: what's there, and what's actually been looked at. This is intelligent coverage: Sybil decides what needs testing and shows exactly where they looked.

An AI scanner can't tell you what it didn't test. Sybil can. Ask "did you try this?" at the finding level, and get an answer.
Diagram showing a Sybil icon connected to GitHub and GitLab logos, representing integration
Sybil integrates with GitHub and GitLab. Findings land where your engineers already work, remediation gets applied through the AI coding assistants they already use, and retests complete in under an hour.
case studies
Trusted  by high velocity  teams

“Sybil has been great. Super helpful. Quick. Only positive things.”

Michael Truell
CEO, Cursor

“We wanted wanted a world-class partner for Turbopuffer’s ongoing pentesting needs, and we couldn’t be happier with our relationship with RunSybil. Quick turnaround, attention to detail, and fun to work with—a partner that will grow with us ❤️🔥”

Simon Eskildsen
CEO, Turbopuffer
Notion logo

"RunSybil was an excellent partner for us. They pressure-tested our systems ahead of a major release and delivered fast, high-quality results at a competitive price on par with top pen-testing firms."

Dana Bost
Senior Technical Program Manager, Notion

“RunSybil’s expertise was instrumental in enhancing our security posture, providing us with critical insights for a confident launch.”

Philip Howes
CTO, Baseten

“Sybil has been great. Super helpful. Quick. Only positive things.”

Michael Truell
CEO, Cursor
turbopuffer logo

“We wanted wanted a world-class partner for Turbopuffer’s ongoing pentesting needs, and we couldn’t be happier with our relationship with RunSybil. Quick turnaround, attention to detail, and fun to work with—a partner that will grow with us ❤️🔥”

Simon Eskildsen
CEO, Turbopuffer
Notion logo

"RunSybil was an excellent partner for us. They pressure-tested our systems ahead of a major release and delivered fast, high-quality results at a competitive price on par with top pen-testing firms."

Dana Bost
Senior Technical Program Manager, Notion

“RunSybil’s expertise was instrumental in enhancing our security posture, providing us with critical insights for a confident launch.”

Philip Howes
CTO, Baseten

“Sybil has been great. Super helpful. Quick. Only positive things.”

Michael Truell
CEO, Cursor
turbopuffer logo

“We wanted wanted a world-class partner for Turbopuffer’s ongoing pentesting needs, and we couldn’t be happier with our relationship with RunSybil. Quick turnaround, attention to detail, and fun to work with—a partner that will grow with us ❤️🔥”

Simon Eskildsen
CEO, Turbopuffer
Notion logo

"RunSybil was an excellent partner for us. They pressure-tested our systems ahead of a major release and delivered fast, high-quality results at a competitive price on par with top pen-testing firms."

Dana Bost
Senior Technical Program Manager, Notion

“RunSybil’s expertise was instrumental in enhancing our security posture, providing us with critical insights for a confident launch.”

Philip Howes
CTO, Baseten

“Sybil has been great. Super helpful. Quick. Only positive things.”

Michael Truell
CEO, Cursor
turbopuffer logo

“We wanted wanted a world-class partner for Turbopuffer’s ongoing pentesting needs, and we couldn’t be happier with our relationship with RunSybil. Quick turnaround, attention to detail, and fun to work with—a partner that will grow with us ❤️🔥”

Simon Eskildsen
CEO, Turbopuffer
Notion logo

"RunSybil was an excellent partner for us. They pressure-tested our systems ahead of a major release and delivered fast, high-quality results at a competitive price on par with top pen-testing firms."

Dana Bost
Senior Technical Program Manager, Notion

“RunSybil’s expertise was instrumental in enhancing our security posture, providing us with critical insights for a confident launch.”

Philip Howes
CTO, Baseten
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Faq
Common questions.
What does Sybil test?

Sybil tests your web and API attack surface — authenticated functionality, access control, business logic, injection, multi-tenant isolation, and novel bugs — mapped as connected exploit chains rather than isolated findings.

No. Sybil runs black-box by default; credentials and source code are both optional. Credentials get you the same depth as a traditional third-party pentest. Source code adds white-box coverage and code-level remediation.

Every finding passes a multi-agent validation pipeline: a critique pass, a reproducibility check on a clean session, a dedicated false-positive triage agent, and duplicate detection. Anything that doesn't survive every stage gets dropped.

Engagements start the same day you onboard. Smaller applications complete same-day; large, complex applications take up to 24 hours. Retests complete in under an hour, with no scheduling required.

Yes. RunSybil customers have satisfied SOC 2 Type II and ISO 27001 audits using Sybil's output, which ships pre-formatted with CVSS 3.1 scores and CWE IDs.

The autonomous offensive security platform.